Intake Flap Motor -V157-, REMOVING AND INSTALLING: Installing
WARNING: This page is about a different car, the 2016 Audi A6 Quattro. However, it is still accessible from the selected car via links, so may be relevant.
Install in reverse order of removal. Note the following:
NOTE:
Replace the seals
The hose connections as well as the air guide pipes and hoses must be free of oil and grease before installing.